Multiple Corrosion-Protection Systems for Reinforced-Concrete Bridge Components: Laboratory TestsSource: Journal of Materials in Civil Engineering:;2014:;Volume ( 026 ):;issue: 011Author:David Darwin
,
Matthew O’Reilly
,
JoAnn Browning
,
Carl E. Locke
,
Y. Paul Virmani
,
Jianxin Ji
,
Lien Gong
,
Guohui Guo
,
Jason Draper
,
Lihua Xing
DOI: 10.1061/(ASCE)MT.1943-5533.0000991Publisher: American Society of Civil Engineers
Abstract: Techniques for making epoxy-coated reinforcement more corrosion resistant, including epoxies with increased adhesion to the steel; concrete with a decreased water cement ratio; concrete containing calcium nitrite or one of two organic corrosion inhibitors; bars with a primer coating containing microencapsulated calcium nitrite applied prior to epoxy application; and bars coated with zinc prior to epoxy application are compared based on the chloride content required to initiate corrosion and corrosion losses using the southern exposure and cracked beam tests. The coatings on all bars are penetrated prior to testing to simulate damage in the field. The results indicate that, even when damaged, conventional epoxy coatings result in much higher concrete chloride contents at corrosion initiation and much lower corrosion losses than exhibited by conventional reinforcement. A reduced water-cement ratio, corrosion inhibitors, and the primer coating containing microencapsulated calcium nitrite provide protection in uncracked but less or no protection in cracked concrete. The bars coated with zinc prior to epoxy application exhibit relatively high corrosion rates because of preferential losses to the zinc, and no improvement in corrosion performance is observed for epoxies with increased adhesion.
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contributor author | David Darwin | |
contributor author | Matthew O’Reilly | |
contributor author | JoAnn Browning | |
contributor author | Carl E. Locke | |
contributor author | Y. Paul Virmani | |
contributor author | Jianxin Ji | |
contributor author | Lien Gong | |
contributor author | Guohui Guo | |
contributor author | Jason Draper | |
contributor author | Lihua Xing | |
date accessioned | 2017-05-08T21:57:29Z | |
date available | 2017-05-08T21:57:29Z | |
date copyright | November 2014 | |
date issued | 2014 | |
identifier other | %28asce%29nh%2E1527-6996%2E0000037.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/67391 | |
description abstract | Techniques for making epoxy-coated reinforcement more corrosion resistant, including epoxies with increased adhesion to the steel; concrete with a decreased water cement ratio; concrete containing calcium nitrite or one of two organic corrosion inhibitors; bars with a primer coating containing microencapsulated calcium nitrite applied prior to epoxy application; and bars coated with zinc prior to epoxy application are compared based on the chloride content required to initiate corrosion and corrosion losses using the southern exposure and cracked beam tests. The coatings on all bars are penetrated prior to testing to simulate damage in the field. The results indicate that, even when damaged, conventional epoxy coatings result in much higher concrete chloride contents at corrosion initiation and much lower corrosion losses than exhibited by conventional reinforcement. A reduced water-cement ratio, corrosion inhibitors, and the primer coating containing microencapsulated calcium nitrite provide protection in uncracked but less or no protection in cracked concrete. The bars coated with zinc prior to epoxy application exhibit relatively high corrosion rates because of preferential losses to the zinc, and no improvement in corrosion performance is observed for epoxies with increased adhesion. | |
publisher | American Society of Civil Engineers | |
title | Multiple Corrosion-Protection Systems for Reinforced-Concrete Bridge Components: Laboratory Tests | |
type | Journal Paper | |
journal volume | 26 | |
journal issue | 11 | |
journal title | Journal of Materials in Civil Engineering | |
identifier doi | 10.1061/(ASCE)MT.1943-5533.0000991 | |
tree | Journal of Materials in Civil Engineering:;2014:;Volume ( 026 ):;issue: 011 | |
contenttype | Fulltext |